Insulator pin



E. 'Y. PORTER INSULATOR PIN Jan. 21, 1930.

Filed Nov. 12, 1925 2 Sheets-Sheet 1 mow +m 0 0 WWX W Jan. 21, 1930. E. Y. PORTER INSULATOR PIN Filed Nov. 12, 1923 2 Sheets-Sheet 2 20 Poe-r52,-

Patented Jan. 21, 1930 warren STATES EDWARD Y. PORTER, OF RIVERSIDE, CALIFORNIA INSULATOR PIN Application filed November 12, 1923.

This invention relates to electrical transmission systems and rel-ates particularly to an insulator pin used for supporting the insulators employed for carrying high voltage 5 transmission lines.

It is an object of the invention to provide an insulator pin adapted for use at points where the transmission line is varied from a direct extension and the lines carried at an 19 angle from their original direction. In such instances, a lateral force is exerted upon the insulators and the insulator pins.

The invention provides a pin which is inclined at an angle with respect to the direc- 15 tion of application at which the lateral force is applied, thus resolving the lateral force into a downward component force which Serves to hold the insulator upon the pin, and

a rotational force which is met by flexure stresses in the insulator pin.

It is a further object of the invention to provide an insulator pin of this type which may be secured upon the cross arm by a single bolt and has a base plate which rests upon the cross arm and extends in a direction to provide ample moment to resist the rotational forces incurred in the insulator pin by the lateral application of force through the wire.

A further object of the invention is to pro vide an insulator pin of this character which may be economically constructed and readily secured on the cross arm.

The specific advantages of the invention and further objects thereof will be made evident hereinafter.

Referring to the drawings which are for illustrative purposes only:

Fig. 1 is a fragmentary elevational view showing an insulator mounted upon a cross arm by means of an insulator pin embodying the features of my invention.

Fig. 2 is a fragmentary plan view illustrating the manner in which it is customary to lead a wire at an angle from an insulator and indicating the direction of lateral force incurred thereby.

Fig. 3 is a partially sectioned elevation of an insulator pin.

Fig. 4 is an end elevation thereof.

Fig. 5 is a slight-1y enlarged section taken Serial No. 674,368.

on a plane represented by the line 55 bf Fig. l for the purpose of indicating the section of the pin end of the insulator pin.

Fig. 6 is a view showing an insulator mounted on the insulator pin.

Fig. 7 shows a fabricated form of the invention in use.

Fig. 8 is a plan View corresponding to Fig. 7

Fig. 9 is an end elevation of the fabricated insulator pin.

Fig. 10 is a section taken 011 a plane represented by the line 1010 of Fig. 9.

Fig. 11 is a section taken on a plane represented by the line 11-11 of Fig. 10. A

In Fig. 1 of the drawings, a transmission line pole 15 is shown with a cross arm 16 having an insulator 17 supported by a pin 18. As shown in Fig. 2, a conductor 19 is led up to the insulator on the line '20 and is then carried therefrom at an angle, as indicated at 21. The tension in the line 19 exerts a lateral force entirely separate from the weight of the wire itself, this force being exerted on a line indicated by the arrow The insulator pin as shown in Fig. 3 pro vidcs base and an insulator supporting portion or pin portion 26, the upper end of which has the axis A A thereof disposed at an angle X with respect to the direction B at which the lateral force is applied. On a lead thread member 27 cast on the pin 28, re ferring to Fig. 4, of the member 18, the insulator 17 is generally mounted as shown in Fig. 6 and due to the relative slope of the member 27, the lateral force exerted by the wire 19 in the direction B is resolved into a component acting in the direction of the axis AA and a component force C producing a rotational tendency of the pin supporting portion 26, around the base 25.

It will be noted that the angle X between the direction of force 13 and the line AA is less than 90 degrees, as also is the angle Y between the axis A-A of the base 25. The rotational tendency in the direction C is met by the resistance of the cross arm 16 against the portion D of the base 25. Near the forward end of the base D, from which forward end the insulator supporting portion also eze 100 tends, a bolt hole is formed for receiving a bolt 31 extending through the cross arm so as to clamp the forward end of the plate tightly, against the top face thereof. The pin supporting portion 26 is formed with a solid pin end and 28 which is recessed as indicated at 33 so that the lead thread portion 27 when cast thereupon will be firmly keyed to the end 28 and thus secured against removal. Between the base and the pin end 28, integrally cast walls 34 extend in somewhat conical form, thus disposing the material of the section thereof in a manner to provide marked rigidity.

In Figs. 7 to 11, a fabricated form of the invention is shown. This form is comprised essentially of two stamped metal plates 35 and 36, the plate '35 constituting the pin supporting portion and the plate 36 constituting the base. The plate 35 is rolled into approximately conoidal form with the upper end thereof formed as a cylinder for receiving the cast lead thread member 27 and the lower flared portion thereof having the edges diverged as indicated at 39, so as to provide a triangular opening between these edges and the plate 36, through which opening access to the interior for placing a bolt through the bolt hole 40 is made possible. The lower forward edge 42 of the member 35 is flanged inwardly as indicated at 43 so as to engage the under edge of the base plate 36, in this manner transferring the rotative forces exerted by the lateral application of force from the member 35 to the base plate. Lugs 45 are formed on the plate 36 which extend into openings 46 in the lower edge of the member 35. The inwardly turned lower ends of the edges 39 of the plate 35 rest upon the plate as indicated at 47 and are locked against springing outwardly by the upwardly bent corners 48 of the plate 36. It is customary to mount the insulator pin on the cross arm 50 in the manner indicated at 51, the downwardly projecting points 52 of the plate 35 either being embedded in the top of the cross arm when the arm is of suiiicient width or extending over the edges of the cross arm as indicated at 55 in Fig. 8.

In Figs. 7 and 8, an insulator is shown provided with a channel 62 in the top thereof for receiving the cable or conductor 64. It will be plainly evident that the particular type of insulator employed does not afiect the utility of the invention.

I claim as my invention:

1. In a transmission line the combination of: a cross arm having an upper horizontal surface; an insulator pin resting upon said surface; an insulator supported upon said pin with its axis inclined to the vertical; means at the side of said pin nearest said insulator for securing said pin to said cross arm; and a conductor carried in a groove 7 formed in the top of said insulator, said conductor acting upon said insulator in such a direction as to tend to pull the axis of said insulator into a vertical position and to hold said pin in contact with said horizontal surface.

2. In a transmission line, the combination of: a member providing a horizontal surface an insulator pin supported by said member, said insulator pin having a horizontal base engaging said horizontal surface; an insulator supported in an inclined position by said insulator pin near one end of said base; means near the end of said base adjacent to said insulator for securing said insulator pin to said member; and a conductor supported by said insulator, acting thereon in a direction tending to hold the major part of said base pressurally against said horizontal surface.

3. In a transmission line, the combination of: a member providing a horizontal sur face; an insulator pin supported by said member, said insulator pin having a horizontal base engaging said horizontal surface; an insulator supported in an inclined position by said insulator pin near one end of said base; a vertical bolt extended through said member and said base near the end of said base adjacent to said insulator for securing said insulator pin to said member; and a conductor supported by said insulator, acting thereon in a direction tending to hold the major part of said base pressurally against said horizontal surface.

In testimony whereof, I have hereunto set my hand at Riverside, California, this 2nd day of November, 1923.

EDIVARD Y. PORTER. 

